Avalonia/tests/Avalonia.RenderTests/Controls/NavigationPageTests.cs

using System.Threading.Tasks;
using Avalonia.Controls;
using Avalonia.Layout;
using Avalonia.Media;
using Avalonia.Styling;
using Avalonia.Themes.Simple;
using Xunit;

#if AVALONIA_SKIA
namespace Avalonia.Skia.RenderTests
#else
namespace Avalonia.Direct2D1.RenderTests.Controls
#endif
{
    public class NavigationPageRenderTests : TestBase
    {
        public NavigationPageRenderTests()
            : base(@"Controls\NavigationPage")
        {
        }

        private static Style FontStyle => new Style(x => x.OfType<TextBlock>())
        {
            Setters = { new Setter(TextBlock.FontFamilyProperty, TestFontFamily) }
        };

        private static Border PageContent() => new Border
        {
            Width = 80,
            Height = 40,
            Background = new SolidColorBrush(Color.Parse("#F5F5F5")),
            HorizontalAlignment = HorizontalAlignment.Center,
            VerticalAlignment = VerticalAlignment.Center
        };

        [Fact]
        public async Task NavigationPage_SinglePage_ShowsNavBar()
        {
            var nav = new NavigationPage { Background = Brushes.White };
            nav.Resources["NavigationBarBackground"] = new SolidColorBrush(Color.Parse("#1565C0"));
            nav.Resources["NavigationBarForeground"] = Brushes.White;
            var target = new Decorator { Width = 400, Height = 300, Child = nav };
            await nav.PushAsync(new ContentPage
            {
                Header = "Home",
                Background = Brushes.White,
                Content = PageContent(),
                HorizontalContentAlignment = HorizontalAlignment.Center,
                VerticalContentAlignment = VerticalAlignment.Center
            });

            target.Styles.Add(new SimpleTheme());
            target.Styles.Add(FontStyle);
            await RenderToFile(target);
            CompareImages(skipImmediate: true);
        }

        [Fact]
        public async Task NavigationPage_TwoPages_ShowsBackButton()
        {
            var nav = new NavigationPage { Background = Brushes.White };
            nav.Resources["NavigationBarBackground"] = new SolidColorBrush(Color.Parse("#1565C0"));
            nav.Resources["NavigationBarForeground"] = Brushes.White;
            var target = new Decorator { Width = 400, Height = 300, Child = nav };
            await nav.PushAsync(new ContentPage
            {
                Header = "Home",
                Background = Brushes.White,
                Content = PageContent(),
                HorizontalContentAlignment = HorizontalAlignment.Center,
                VerticalContentAlignment = VerticalAlignment.Center
            });

            await nav.PushAsync(new ContentPage
            {
                Header = "Details",
                Background = Brushes.White,
                Content = PageContent(),
                HorizontalContentAlignment = HorizontalAlignment.Center,
                VerticalContentAlignment = VerticalAlignment.Center
            }, null);

            target.Styles.Add(new SimpleTheme());
            target.Styles.Add(FontStyle);
            await RenderToFile(target);
            CompareImages(skipImmediate: true);
        }

        [Fact]
        public async Task NavigationPage_CustomBarBackground()
        {
            var nav = new NavigationPage { Background = Brushes.White, HasShadow = true };
            nav.Resources["NavigationBarBackground"] = new SolidColorBrush(Color.Parse("#2E7D32"));
            nav.Resources["NavigationBarForeground"] = Brushes.White;
            var target = new Decorator { Width = 400, Height = 300, Child = nav };

            await nav.PushAsync(new ContentPage
            {
                Header = "Green Theme",
                Background = Brushes.White,
                Content = PageContent(),
                HorizontalContentAlignment = HorizontalAlignment.Center,
                VerticalContentAlignment = VerticalAlignment.Center
            });

            target.Styles.Add(new SimpleTheme());
            target.Styles.Add(FontStyle);
            await RenderToFile(target);
            CompareImages(skipImmediate: true);
        }
    }
}